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| author | Ján Tomko <jtomko@redhat.com> | 2014-05-21 11:03:47 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-05-25 12:46:58 +0300 |
| commit | 38dbd48b247ebe05bdc6ef52ccdc60cc21274877 (patch) | |
| tree | e3294ac81369b393769a51b9d41fb4c9384a9d3e /hw/virtio | |
| parent | 7c8b7248261bfa5e54eff1715b699caa8b3f1d77 (diff) | |
| download | qemu-38dbd48b247ebe05bdc6ef52ccdc60cc21274877.zip | |
virtio-balloon: return empty data when no stats are available
If the guest hasn't updated the stats yet, instead of returning
an error, return '-1' for the stats and '0' as 'last-update'.
This lets applications ignore this without parsing the error message.
Related libvirt patch and discussion:
https://www.redhat.com/archives/libvir-list/2014-May/msg00460.html
Tested against current upstream libvirt - stat reporting works and
it no longer logs errors when the stats are queried on domain startup.
(Note: libvirt doesn't use the last-update field for anything yet)
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'hw/virtio')
| -rw-r--r-- | hw/virtio/virtio-balloon.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index bf2b588b24..22cd52edee 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -112,11 +112,6 @@ static void balloon_stats_get_all(Object *obj, struct Visitor *v, VirtIOBalloon *s = opaque; int i; - if (!s->stats_last_update) { - error_setg(errp, "guest hasn't updated any stats yet"); - return; - } - visit_start_struct(v, NULL, "guest-stats", name, 0, &err); if (err) { goto out; @@ -378,6 +373,8 @@ static void virtio_balloon_device_realize(DeviceState *dev, Error **errp) s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats); + reset_stats(s); + register_savevm(dev, "virtio-balloon", -1, 1, virtio_balloon_save, virtio_balloon_load, s); |